Android 讀取網頁字串

 

import android.os.Handler;
import android.os.Looper;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class http_load_web_string {



    public  interface  ActionListener{
        public  void get_string(String str);
    }

    public  ActionListener actionListener=null;
    private String target_url;
    private  String result;
    private void load_json_from_url(String myurl){


        HttpURLConnection connection = null;
        BufferedReader reader = null;
        try {

            URL url = new URL(myurl);
            connection = (HttpURLConnection) url.openConnection();
            connection.connect();

            InputStream stream = connection.getInputStream();
            reader = new BufferedReader(new InputStreamReader(stream));
            StringBuffer buffer = new StringBuffer();
            String line = "";

            while ((line = reader.readLine()) != null) {
                buffer.append(line + "\n");
            }


            result=buffer.toString();


        }catch (Exception e){


        } finally {


            if (connection != null) {
                connection.disconnect();
            }
            try {
                if (reader != null) {
                    reader.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }

        }






    }

    public  void load_from_url(String url){

        this.target_url=url;

        ExecutorService executor = Executors.newSingleThreadExecutor();
        Handler handler = new Handler(Looper.getMainLooper());

        executor.execute(new Runnable() {
            @Override
            public void run() {

                load_json_from_url(target_url);
                handler.post(new Runnable() {
                    @Override
                    public void run() {
                        if(actionListener!=null){
                            actionListener.get_string(result);
                        }

                    }
                });


            }
        });


    }

}